Hey Ayce, nice post.

Murus Dacicus -
In most cases, they're very late for our time period, most remains are after our period. We could represent it in-game, but it would probably be through the Greek stone wall, which is the same size as the oppida walls, so there isn't any reason to upgrade. The larger walls are simply too large for the things the Getai built.

game fields -
something like that could work. i think people have speculated that games may have been played at sarmiszegethusa, and most warrior societies embraced games as a form of less murderous (but usually equally violent) war.

DSF and ESMR -
nice ideas for upper level farming types. we'll keep those in mind with eb2, for sure, and perhaps can look at them with 1.1. to be honest, most of our emphasis is switching over to eb2, so they're more likely to appear there.